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CAT'S EYE JEWELLERY
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In gemology, chatoyancy (/ʃəˈtɔɪ.ənsi/ shə-toy-ən-see), or chatoyance or cat's eye effect,[1] is an optical reflectance effect seen in certain gemstones. Coined from the French "œil de chat," meaning "cat's eye," chatoyancy arises either from the fibrous structure of a material, as in tiger's eye quartz, or from fibrous inclusions or cavities within the stone, as in cat's eye chrysoberyl.[2][3] The precipitates that cause chatoyance in chrysoberyl are the mineral rutile, composed mostly of titanium dioxide. There was no evidence of tubes or fibers in the samples examined. The rutile precipitates were all aligned perpendicularly with respect to cat's eye effect. It is reasoned that the lattice parameter of the rutile matches only one of the three orthorhombic crystal axes of the chrysoberyl, resulting in preferred alignment along that direction.


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